Optimus and the other Autobots such as Bee, Hound, Drift, and Crosshairs, along with the human Cade Yeager, had to get some intel on the Decepticons but had no way of doing that. “Had” being the key word.

As reluctant as Optimus was to call you in, they needed you. You were a Decepticon but you also weren’t at the same time. A rogue Decepticon, if you will. So now, Optimus and the other Autobots are waiting for you to arrive. After a bit, you finally drove into the alley way where you all were meeting